Microwave semisweet chocolate morsels and whipping cream in a 2-quart microwave-safe bowl at MEDIUM (50% power) 2 1/2 to 3 minutes or until chocolate begins to melt.
Whisk until chocolate melts and mixture is smooth. Whisk in butter; let stand 20 minutes. Beat at medium speed with an electric mixer 3 to 4 minutes or until mixture forms soft peaks.
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